there is a high pitched noise from the engine bay when the truck is running, it sounds like a fuel pump when u 1st turn the the key but don't start the truck but of course its not the fuel pump, it sounds like its coming from the right side of the supercharger. any ideas?

 

I get a similar noise when it is cold outside. When it is very very cold I some times get a super high pitched loud noise for a few seconds after driving for a few minutes. It happens every winter when its gets very cold. After the truck warms up the super high pitched noise won’t happen but the slight high pitched (fuel pump sound) is always there when its cold out. I know mine is nothing to worry about since it happened from day one. Hope this helps. Not sure if it’s the same thing as yours.

 

I've experienced a lower pitched hum from the IAC valve before. (on a 4.6L)

Had to wind up replacing it at $65

Rich

 

well its about 50degress out side today and well im jsut not sure
here is a sound clip of what it is

Right Click save as

 

No that's nothing like what mine sounded.

Rich

 

Hmmm, that is much higher pitched then the soound I get. Thats almost like the second noise I was talking about that only happens for a couple of seconds when it is very very cold.

I have no idea what that could be

 

Disconnect both Belts and eliminate the pulley system. These pully bearings do weird crap when the temps start to drop.

 

Any updates ???

 

gokorn1:

Mine is doing the EXACT same thing...the past few mornings here
in Georgia have been 19-25 degrees...it seems to be coming from the fuel pump......in the am, crank it up and listen at your left rear wheel (at the gas tank)...it is an electrical type pitched sound.